Simine Vazire, Ph.D., Washington University assistant professor of psychology in Arts & Sciences, has found that the individual is more accurate in assessing one's own internal, or neurotic traits, such as anxiety, while friends are better barometers of intellect-related traits, such as intelligence and creativity, and even strangers are equally adept as our friends and ourselves at spotting the extrovert in us all, a psychology domain known as "extroversion."

"I think that it's important to really question this knee-jerk reaction that we are our own best experts," says Vazire.